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Chem 1151 Review

Chem 1151 Review. Chapters 5-7. Chap 5. Memorize ideal gas law (and related laws: Boyle, Charles, Avogadro, gas density), root mean square speed eqn and relationship to effusion rate, gas mixtures and Dalton’s Law (memorize eqn), KMT, avg kinetic energy eqn, STP

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Chem 1151 Review

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  1. Chem 1151 Review Chapters 5-7

  2. Chap 5 • Memorize ideal gas law (and related laws: Boyle, Charles, Avogadro, gas density), root mean square speed eqn and relationship to effusion rate, gas mixtures and Dalton’s Law (memorize eqn), KMT, avg kinetic energy eqn, STP • What is the pressure of 91.3 g oxygen in a 8.58 L cylinder at 21 oC?

  3. Chap 5 • Calculate the density of ammonia gas at 31 oC and 751 mm Hg. Mg3N2(s) + 6H2O(l)  3Mg(OH)2(s) + 2NH3(g) What volume of NH3 is produced at 24 oC and 753 mmHg from 4.56 g Mg3N2? • A 200.0 mL flask contains 1.03 mg O2 and 0.56 mg He at 15 oC. Calculate the partial and total pressures.

  4. Chap 5 • Calc the rms speed of CO2 at STP. At what temperature must N2O4 be to have the same rms speed? • 4.83 mL of an unknown gas effuses in the same time it takes 9.23 mL Ar. Assuming the same effusion container and conditions, what is the mass of the unknown?

  5. Chap 5 • 2LiOH(s) + CO2(g)  Li2CO3(s) + H2O(l) How many grams of LiOH are needed to react with 5.8E+2 L CO2at STP? • 2HCl(aq) + MgCO3(s)  CO2(g) + H2O(l) + MgCl2(aq) An 18.6 mL volume of HCl reacts completely with solid MgCO3. The volume of CO2 formed is 159 mL at 23 oC and 731 mm Hg. What is the molarity of the HCl soln?

  6. Chap 6 • Memorize q = ms ΔT, First Law, defn of heat of formation rxn, ΔHrxn = appropriate summation of heats of formation of reactants and products, also ≈ approp. Summation of bond energies (D values, Ch 8) • 6.49 • Hess’s Law problems • Sign conventions, exo- and endo-thermic

  7. Chap 6 2H2S(g) + 3O2 (g)  2H2O(l) + 2SO2 (g) • Calculate ΔHrxn • If 100.0 g H2S burns in xs oxygen, how much heat is released? • If 800.0 kJ of energy was released, how many grams of SO2were produced? • Calculate ΔHrxn for H2O(l) + SO2 (g)  H2S(g) + 3/2 O2 (g).

  8. Chap 7 • Memorize E = hν = hc/λ • Learn quantum number meaning and relationships, to write electronic configurations for neutral and charged atoms • Learn periodicity of IE, EA, atomic size, electronegativity • Paramagnetic vs diamagnetic atoms

  9. Chap 7 • Bohr atom and electronic transitions • de Broglie Eqn λ = h/(mv) • Calculate the energy for photons with • 1.365E+6 Hz frequency • 535 nm wavelength • Describe the AO shapes for s, p, d orbitals • State the number of orbitals in 3d, 4p, 6s; state the max # of electrons in them

  10. Chap 7 • Write the electron configs for Mn, S, Cr, K, Si, Ti2+, Na+, Cl- Which are paramagnetic? • Arrange in order of • increasing IE: Mg, Ca, S • increasing size: F, S, Cl • More negative EA: As, Br • More negative EA: Se, K • Increasing size: S2-, K+, Ar

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